compiler: add syscalls for 32-bit arm
Этот коммит содержится в:
Ayke van Laethem
Ron Evans
родитель
4b477fad55
коммит
93d5269fef
4 изменённых файлов: 72 добавлений и 21 удалений
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@ -15,8 +15,11 @@ addons:
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- llvm-7-dev
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- clang-7
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- libclang-7-dev
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- gcc-arm-linux-gnueabi
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- binutils-arm-none-eabi
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- libc6-dev-armel-cross
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- qemu-system-arm
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- qemu-user
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- gcc-avr
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- avr-libc
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@ -5,6 +5,7 @@ package compiler
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import (
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"go/constant"
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"strconv"
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"golang.org/x/tools/go/ssa"
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"tinygo.org/x/go-llvm"
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@ -14,6 +15,7 @@ import (
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// OS/arch.
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func (c *Compiler) emitSyscall(frame *Frame, call *ssa.CallCommon) (llvm.Value, error) {
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num, _ := constant.Uint64Val(call.Args[0].(*ssa.Const).Value)
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var syscallResult llvm.Value
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switch {
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case c.GOARCH == "amd64" && c.GOOS == "linux":
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// Sources:
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@ -43,25 +45,60 @@ func (c *Compiler) emitSyscall(frame *Frame, call *ssa.CallCommon) (llvm.Value,
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constraints += ",~{rcx},~{r11}"
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fnType := llvm.FunctionType(c.uintptrType, argTypes, false)
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target := llvm.InlineAsm(fnType, "syscall", constraints, true, false, llvm.InlineAsmDialectIntel)
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syscallResult := c.builder.CreateCall(target, args, "")
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// Return values: r1, r1, err uintptr
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// Pseudocode:
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// var err uintptr
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// if syscallResult < 0 && syscallResult > -4096 {
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// err = -syscallResult
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// }
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// return syscallResult, 0, err
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zero := llvm.ConstInt(c.uintptrType, 0, false)
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inrange1 := c.builder.CreateICmp(llvm.IntSLT, syscallResult, llvm.ConstInt(c.uintptrType, 0, false), "")
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inrange2 := c.builder.CreateICmp(llvm.IntSGT, syscallResult, llvm.ConstInt(c.uintptrType, 0xfffffffffffff000, true), "") // -4096
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hasError := c.builder.CreateAnd(inrange1, inrange2, "")
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errResult := c.builder.CreateSelect(hasError, c.builder.CreateNot(syscallResult, ""), zero, "syscallError")
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retval := llvm.Undef(llvm.StructType([]llvm.Type{c.uintptrType, c.uintptrType, c.uintptrType}, false))
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retval = c.builder.CreateInsertValue(retval, syscallResult, 0, "")
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retval = c.builder.CreateInsertValue(retval, zero, 1, "")
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retval = c.builder.CreateInsertValue(retval, errResult, 2, "")
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return retval, nil
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syscallResult = c.builder.CreateCall(target, args, "")
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case c.GOARCH == "arm" && c.GOOS == "linux":
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// Implement the EABI system call convention for Linux.
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// Source: syscall(2) man page.
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args := []llvm.Value{}
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argTypes := []llvm.Type{}
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// Constraints will look something like:
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// ={r0},0,{r1},{r2},{r7},~{r3}
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constraints := "={r0}"
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for i, arg := range call.Args[1:] {
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constraints += "," + [...]string{
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"0", // tie to output
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"{r1}",
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"{r2}",
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"{r3}",
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"{r4}",
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"{r5}",
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"{r6}",
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}[i]
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llvmValue, err := c.parseExpr(frame, arg)
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if err != nil {
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return llvm.Value{}, err
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}
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args = append(args, llvmValue)
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argTypes = append(argTypes, llvmValue.Type())
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}
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args = append(args, llvm.ConstInt(c.uintptrType, num, false))
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argTypes = append(argTypes, c.uintptrType)
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constraints += ",{r7}" // syscall number
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for i := len(call.Args) - 1; i < 4; i++ {
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// r0-r3 get clobbered after the syscall returns
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constraints += ",~{r" + strconv.Itoa(i) + "}"
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}
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fnType := llvm.FunctionType(c.uintptrType, argTypes, false)
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target := llvm.InlineAsm(fnType, "svc #0", constraints, true, false, 0)
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syscallResult = c.builder.CreateCall(target, args, "")
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default:
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return llvm.Value{}, c.makeError(call.Pos(), "unknown GOOS/GOARCH for syscall: "+c.GOOS+"/"+c.GOARCH)
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}
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// Return values: r0, r1, err uintptr
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// Pseudocode:
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// var err uintptr
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// if syscallResult < 0 && syscallResult > -4096 {
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// err = -syscallResult
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// }
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// return syscallResult, 0, err
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zero := llvm.ConstInt(c.uintptrType, 0, false)
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inrange1 := c.builder.CreateICmp(llvm.IntSLT, syscallResult, llvm.ConstInt(c.uintptrType, 0, false), "")
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inrange2 := c.builder.CreateICmp(llvm.IntSGT, syscallResult, llvm.ConstInt(c.uintptrType, 0xfffffffffffff000, true), "") // -4096
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hasError := c.builder.CreateAnd(inrange1, inrange2, "")
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errResult := c.builder.CreateSelect(hasError, c.builder.CreateNot(syscallResult, ""), zero, "syscallError")
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retval := llvm.Undef(llvm.StructType([]llvm.Type{c.uintptrType, c.uintptrType, c.uintptrType}, false))
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retval = c.builder.CreateInsertValue(retval, syscallResult, 0, "")
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retval = c.builder.CreateInsertValue(retval, zero, 1, "")
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retval = c.builder.CreateInsertValue(retval, errResult, 2, "")
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return retval, nil
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}
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14
main_test.go
14
main_test.go
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@ -42,7 +42,7 @@ func TestCompiler(t *testing.T) {
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}
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defer os.RemoveAll(tmpdir)
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t.Log("running tests on the host...")
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t.Log("running tests on host...")
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for _, path := range matches {
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t.Run(path, func(t *testing.T) {
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runTest(path, tmpdir, "", t)
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@ -53,7 +53,17 @@ func TestCompiler(t *testing.T) {
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return
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}
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t.Log("running tests on the qemu target...")
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t.Log("running tests for linux/arm...")
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for _, path := range matches {
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if path == "testdata/cgo/" {
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continue // TODO: improve CGo
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}
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t.Run(path, func(t *testing.T) {
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runTest(path, tmpdir, "arm--linux-gnueabi", t)
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})
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}
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t.Log("running tests for emulated cortex-m3...")
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for _, path := range matches {
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t.Run(path, func(t *testing.T) {
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runTest(path, tmpdir, "qemu", t)
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@ -218,10 +218,11 @@ func defaultTarget(goos, goarch, triple string) (*TargetSpec, error) {
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}
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if goarch != runtime.GOARCH {
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// Some educated guesses as to how to invoke helper programs.
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if goarch == "arm" {
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if goarch == "arm" && goos == "linux" {
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spec.Linker = "arm-linux-gnueabi-gcc"
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spec.Objcopy = "arm-linux-gnueabi-objcopy"
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spec.GDB = "arm-linux-gnueabi-gdb"
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spec.Emulator = []string{"qemu-arm", "-L", "/usr/arm-linux-gnueabi"}
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}
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if goarch == "arm64" {
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spec.Linker = "aarch64-linux-gnu-gcc"
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